gregd

Greeting ALL;

Problem;
Having heater problems. Intermittently i am having problems with the heater blowing cool air instead of heat. Engine temp gauge reads normal...1/2 scale.
Checked coolant level and it is normal. No leaks present at all.
Sometimes i will start car and it will blow hot air after warming up as normal and then on trip the air will just go cool. Shut car off and restart later and waa-laa.. heat.... but occasionally i will still get no heat..until on return trip and then heat just starts to work again.
This problem occurs whether i use remote start or just a regular key start ..if that helps troubleshoot.
I have heard about temp problems from side to side... but i get no heat on either side....all vent positions...even defrost is cool...
HELP!!!!!!

PeteMiz

2006 Impala LTZ.

Just noticed I am experiencing the exact same problem. Was thinking thermostat but thought I would look here first. Usually drive highway and never noticed it before, driving around town this morning it was clearly blowing cold air. I did notice that it was blowing hot air when I was briefly on the highway.

Any insight or experience with this issue would be appreciated, I did read one thing about actuators, but why would that let me have heat on the highway?!

donmateo

^Blows cold air longer than the warmup time?

__________________

gregd

For me i have cold air even after sufficient warm up... engine temp in normal range....
But biggest problem is it is intermittent.... so it makes it kinda difficult to troubleshoot.

Hersbird

You could have an air pocket in the cooling system. The dealer uses a specific procedure to refill the system to eliminate air pockets and possibly a special fill tool. It also could be something in the heater core that is partially blocking flow and moving around. I suspect an air pocket though.

ten_ton

My driver side was blowing cold only when set to hot in my '08 SS. I took it in to the dealer, and it was the heat actuator that failed. I bet yours is failing too. Luckily my car was under warantee, but I think it would of been around $80 to replace.

__________________
The last thing you see......

diagger

Hope you've already fixed your problem. If you haven't, I agree with other posts suggesting you may have an air pocket in the cooling system. It's a common problem on this model. The best way to bleed the heater circuit is to;

1.) Let the engine cool down. (Important)
Then, Remove the pressure cap.
2.) Remove the upper heater hose from the engine side.
3.) Fill the metal pipe with coolant mix until full.
4.) Raise the rubber hose as high as it will go and fill the hose untill full.
5.) Re-connect the hose and tighten the clamp.
6.) Run the engine at 1800 rpm (helper) while topping off the coolant.
When the system is full and warm, install the pressure cap.
7.) Now, return the engine to idle speed.
8.) Top off the coolant reservoir and try out your heater.

The heater hoses are a high point in the system and air gets trapped in high points. When the coolant is warm, trapped air expands and makes the problem worse. When you let it cool down, the air contracts. You should find out why the coolant level went down in the first place.

Please let us know the status of your problem. Good luck. Stay safe.

wheeler82

pretty sure its the heat actuator....i had this Exact same problem on my previous 07...it was intermintant..im pretty sure it was only on the passenger side too...my 06 luckly hasn't done it yet but i never did get the 07 fixed but the actuator sounds more logical to me than air in the lines

__________________
2006 impala 3.5 engine..road machine!

mville656

Hello all. I drive a 07 Impala with a 3.9 for my work car. I am having similar issues with my heater. If I start my car and leave it idle it will not blow heat. It started doing this several months ago. The gauge can read in the normal range with no change to performace of the heater. It was not an issue and the repair shops around here are not very good with "newer cars". The problem has gotten progressively worse. Now anytime I idle for more than a couple of minutes there doesn't seem to be enough coolant flow through the heater core to provide heat in the cabin. If I rev the engine a little the heat starts back up again. On several occasions I have heard some gurggling in the heater box area so I am leaning towards there being air in the system. At first I thought it was electrical or a vacuum problem due to the high mileage of my car. If any one knows the solution to this problem please let us know. My friend also drives the same car only with about 15000 miles and a 2010. He just started having the same issues. The only thing he has had done to his car is have the power steering pump replaced. Thanks for all the great information, Mike

Hersbird

There is air in the system, the fix is 2 posts above yours or take it to the dealer and pay them probably $100.

rangel515

Thanx diagger for the post. Might come in handy for me in the future

new2ltzfamily

had the exact same issue on my '08 ltz. gasket on waterpump and a hose leaking caused the coolant to be low and so it didn't flow to heater core. it was fixed under drivetrain warrenty. i have 37,000 miles on it but that goes to 100,000 miles.

impala39L

Im wondering if my issue is related but when i start the car and it idles even if at normal engine temp i get cold air while sitting. Once I start driving the air heats up and is fine but if I stop at a lite and it idles boom its back to cold air. So being in ohio it sucks during the winter lol. Any ideas on whats causing this.

tmusquiez

I don't know about ya'll but I would love that "feature" here in Texas.

zerominak

water pump for me with this issue... seems to be something common with an Impala... I went ahead and replaced the thermostat also since I was down there and the serpentine belt... also you have to burp your baby haha...